[Editor’s note: Kudos to Kat Downs for wiring up this interactive, zoomable map of the United States showing unemployment rate by county. There’s a slider to see data back in time. I did the base map using my map generalization skills honed on Natural Earth. Using data that is appropriately generalized for the display scale cuts down on file size and reduces lag before data display.]

[Editor’s note: Uses the Flare visualization API in Flash ActionScript 3 to display data about the Post 200 companies in a treemap format. A vexing and il-documented API, but powerful. We considered showing the data with a graduated circle map but the company locations were too clustered for that to be effective.]

Republished from The Washington Post.13 May 2009. By Nathaniel Vaughn Kelso and Terri Rupar – The Washington Post

Use our interactive graphic to explore data — including revenue and employment — for the top companies in the Washington area.

Boxes represent individual companies grouped together by sector, size based on data.